SSO 无法与 OpenSSH 配合使用 - 我无法让 GSSAPIAuthentication 与 Kerberos 配合使用。每次我尝试登录时，系统都会不断提示我输入密码。
在故障排除过程中，我在这里启动了调试：
[foster@kvm0007 ~]$ kinit
Password for [email protected]:
[foster@kvm0007 ~]$ ssh -p222 -K [email protected] -vvv
OpenSSH_5.3p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /home/users/foster/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to kerberos.monzell.com [192.168.15.100] port 222.
debug1: Connection established.
debug1: identity file /home/users/foster/.ssh/identity type -1
debug1: identity file /home/users/foster/.ssh/id_rsa type -1
debug3: Not a RSA1 key file /home/users/foster/.ssh/id_dsa.
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug3: key_read: missing keytype
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug3: key_read: missing whitespace
debug2: key_type_from_name: unknown key type '-----END'
debug3: key_read: missing keytype
debug1: identity file /home/users/foster/.ssh/id_dsa type 2
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug3: Wrote 792 bytes for a total of 813
debug1: SSH2_MSG_KEXINIT received
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[email protected],zlib
debug2: kex_parse_kexinit: none,[email protected],zlib
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[email protected]
debug2: kex_parse_kexinit: none,[email protected]
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit:
debug2: kex_parse_kexinit: first_kex_follows 0
debug2: kex_parse_kexinit: reserved 0
debug2: mac_setup: found hmac-md5
debug1: kex: server->client aes128-ctr hmac-md5 none
debug2: mac_setup: found hmac-md5
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug3: Wrote 24 bytes for a total of 837
debug2: dh_gen_key: priv key bits set: 132/256
debug2: bits set: 499/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: Wrote 144 bytes for a total of 981
debug3: put_host_port: [192.168.15.100]:222
debug3: put_host_port: [kerberos.monzell.com]:222
debug3: check_host_in_hostfile: filename /home/users/foster/.ssh/known_hosts
debug3: check_host_in_hostfile: filename /etc/ssh/ssh_known_hosts
debug3: check_host_in_hostfile: filename /home/users/foster/.ssh/known_hosts
debug3: check_host_in_hostfile: filename /etc/ssh/ssh_known_hosts
debug1: checking without port identifier
debug3: check_host_in_hostfile: filename /home/users/foster/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 1
debug3: check_host_in_hostfile: filename /home/users/foster/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 1
debug1: Host 'kerberos.monzell.com' is known and matches the RSA host key.
debug1: Found key in /home/users/foster/.ssh/known_hosts:1
debug1: found matching key w/out port
debug2: bits set: 505/1024
debug1: ssh_rsa_verify: signature correct
debug2: kex_derive_keys
debug2: set_newkeys: mode 1
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: Wrote 16 bytes for a total of 997
debug2: set_newkeys: mode 0
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug3: Wrote 48 bytes for a total of 1045
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /home/users/foster/.ssh/identity ((nil))
debug2: key: /home/users/foster/.ssh/id_rsa ((nil))
debug2: key: /home/users/foster/.ssh/id_dsa (0x7fed559e5d30)
debug3: Wrote 64 bytes for a total of 1109
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password
debug3: preferred gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup gssapi-with-mic
debug3: remaining preferred: publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-with-mic
debug1: Next authentication method: gssapi-with-mic
debug3: Trying to reverse map address 192.168.15.100.
debug2: we sent a gssapi-with-mic packet, wait for reply
debug3: Wrote 96 bytes for a total of 1205
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug2: we sent a gssapi-with-mic packet, wait for reply
debug3: Wrote 96 bytes for a total of 1301
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug2: we sent a gssapi-with-mic packet, wait for reply
debug3: Wrote 96 bytes for a total of 1397
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug2: we sent a gssapi-with-mic packet, wait for reply
debug3: Wrote 96 bytes for a total of 1493
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug2: we did not send a packet, disable method
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /home/users/foster/.ssh/identity
debug3: no such identity: /home/users/foster/.ssh/identity
debug1: Trying private key: /home/users/foster/.ssh/id_rsa
debug3: no such identity: /home/users/foster/.ssh/id_rsa
debug1: Offering public key: /home/users/foster/.ssh/id_dsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug3: Wrote 528 bytes for a total of 2021
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
[email protected]'s password:
如您所见，gssapi-with-mic 已发送，但没有可判定的响应。
事实证明，这似乎是发送给 KDC 的信息：
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received
debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT
debug1: SSH2_MSG_KEX_DH_GEX_REPLY sent
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: KEX done
debug1: userauth-request for user foster service ssh-connection method none
debug1: attempt 0 failures 0
debug1: PAM: initializing for "foster"
debug1: PAM: setting PAM_RHOST to "192.168.15.37"
debug1: PAM: setting PAM_TTY to "ssh"
debug1: userauth-request for user foster service ssh-connection method gssapi-with-mic
debug1: attempt 1 failures 0
debug1: Unspecified GSS failure. Minor code may provide more information
**No key table entry found for host/[email protected]**
debug1: userauth-request for user foster service ssh-connection method gssapi-with-mic
debug1: attempt 2 failures 0
debug1: userauth-request for user foster service ssh-connection method gssapi-with-mic
debug1: attempt 3 failures 0
debug1: userauth-request for user foster service ssh-connection method gssapi-with-mic
debug1: attempt 4 failures 0
debug1: userauth-request for user foster service ssh-connection method publickey
debug1: attempt 5 failures 0
debug1: test whether pkalg/pkblob are acceptable
debug1: temporarily_use_uid: 502/502 (e=0/0)
debug1: trying public key file /home/users/foster/.ssh/authorized_keys
debug1: restore_uid: 0/0
debug1: temporarily_use_uid: 502/502 (e=0/0)
debug1: trying public key file /home/users/foster/.ssh/authorized_keys2
debug1: restore_uid: 0/0
一些研究表明这可能是主机文件的问题，我的情况如下：
[foster@sl6 ~]$ cat /etc/hosts
127.0.0.1 localhost.localdomain localhost
::1 sl6 localhost6.localdomain6 localhost6
192.168.15.100 kerberos.monzell.com kerberos
192.168.15.100 monzell.com
192.168.15.31 kvm0001.monzell.com kvm0001
我尝试在主机上设置主机名手册，但没有效果。
以下是 KDC 负责人名单：
[root@sl6 ~]# kadmin.local
Authenticating as principal rilindo/[email protected] with password.
kadmin.local: listprincs
K/[email protected]
[email protected]
host/[email protected]
host/[email protected]
[email protected]
kadmin/[email protected]
kadmin/[email protected]
kadmin/[email protected]
krbtgt/[email protected]
[email protected]
rilindo/[email protected]
[email protected]
Kerberos 负责大部分身份验证。用户目录位于 OpenLDAP 中。客户端和服务器都运行 Scientific Linux 6.1，客户端作为服务器上的 VM 运行。
我可以确认 Kerberos 在 OpenSSH 之外工作，如下所示：
[foster@kvm0007 ~]$ /usr/kerberos/bin/krsh -x -PN kerberos.monzell.com
This rlogin session is encrypting all data transmissions.
Last login: Sun Sep 25 21:18:20 from 192.168.15.37
相关用户具有以下 ssh 配置文件：
[foster@sl6 ~]$ cat .ssh/config
GSSAPIAuthentication yes
GSSAPIDelegateCredentials yes
GSSAPITrustDns yes
从这一点出发我应该朝哪个方向走？
编辑：我知道我忘了在这篇文章中添加一些内容。这是服务器上的 krb5.conf：
[root@sl6 ~]# cat /etc/krb5.conf
[logging]
default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log
[libdefaults]
default_realm = MONZELL.COM
dns_lookup_realm = false
dns_lookup_kdc = false
ticket_lifetime = 24h
renew_lifetime = 7d
forwardable = true
[realms]
MONZELL.COM = {
kdc = kerberos.monzell.com
admin_server = kerberos.monzell.com
}
[domain_realm]
.monzell.com = MONZELL.COM
monzell.com = MONZELL.COM
在客户端上：
[rilindo@kvm0007 ~]$ cat /etc/krb5.conf
[logging]
default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log
[libdefaults]
default_realm = MONZELL.COM
dns_lookup_realm = false
dns_lookup_kdc = false
ticket_lifetime = 24h
renew_lifetime = 7d
forwardable = true
[realms]
EXAMPLE.COM = {
kdc = kerberos.example.com
admin_server = kerberos.example.com
}
MONZELL.COM = {
kdc = kerberos.monzell.com
admin_server = kerberos.monzell.com
}
[domain_realm]
.example.com = EXAMPLE.COM
example.com = EXAMPLE.COM
monzell.com = MONZELL.COM
.monzell.com = MONZELL.COM
答案1
可能是简单的主机名问题或域领域映射问题。
（可能是第一个问题，但为了完整性，这里同时包括这两个问题。）
主机名问题
hostname -f在 kerberos.monzell.com 上
应该返回：kerberos.monzell.com
应该不是返回：localhost.localdomain
域领域映射问题
dig -t txt _kerberos.kerberos.monzell.com
dig -t txt _kerberos.monzell.com
如果你不想使用/etc/krb5.conf应该返回
<record> <ttl num> IN TXT "MONZELL.COM".
但是，鉴于 hosts 文件，情况可能并非如此。
/etc/krb5.conf应该包含：
[domain_realm]
.monzell.com MONZELL.COM
或者
[domain_realm]
kerberos.monzell.com MONZELL.COM